An Electrical Method for Measuring Fatigue and Tensile Properties of Thin Films on Substrates

Two new polyphosphazenes, poly(4-maleimidophenoxy/phenoxy)phosphazene and poly(4-phthalimidophenoxy/phenoxy)phosphazene, were prepared and used to toughen a PMR polyimide designated LaRCTMRP46. These toughened polyimides were evaluated as thin films with a 0–40 wt% range of polyphosphazene to polyimide. The structure–property relationships of these inorganic/organic polymeric matrices were studied and evaluated in terms of fracture toughness, thermo-oxidative stability, and thermal, mechanical, and tensile properties. The hybrid systems revealed an increase in fracture toughness up to 20 wt% polyphosphazene load without any substantial loss in tensile properties. With 5 wt% poly(4-phthalimidophenoxy/phenoxy)phosphazene loading, the fracture toughness of the semi-interpenetrating network was increased by 124%. When 10 wt% poly(4- maleimidophenoxy/phenoxy)phosphazene loading was used, the fracture toughness of the grafted copolymer was improved by 217%. In addition, substantial enhancement in thermo-oxidative stability was also observed.

Download Full-text

Nanomechanics of Thin Films: Emphasis: Tensile Properties

MRS Proceedings ◽

10.1557/proc-130-295 ◽

1988 ◽

Vol 130 ◽

Cited By ~ 29

Author(s):

R. W. Hoffman

Keyword(s):

Thin Films ◽

Tensile Properties ◽

Plastic Region ◽

Strain Curve ◽

Bulk Specimen ◽

Alumina Films ◽

Grain Sizes ◽

Preliminary Annealing ◽

Structure Sensitive ◽

Microscopic Interpretation

AbstractTensile properties of thin films may be interpreted as a structure sensitive plastic region superposed on an elastic background in a manner similar to bulk specimen tensile testing. However, the limitations of both the material and tensile instrument have not usually been tested in detail.We report our experience with aluminum and alumina films some 100 nm thick prepared by evaporation of Al followed by anodization for the alumina film. Self-supporting films are glued to glass “jaws” of the nanotensilometer and force-elongation data recorded. Mounting thickness, glue slip-page, instrument calibration, and other possible artifacts will be examined in detail. A typical Al stress-strain curve has an initial small curved region interpreted as a mounting artifact, followed by a primarily elastic (near linear) region and increasing plastic deformation until failure occurs. Alumina films fail in a brittle manner. Characterization techniques include TEM, RBS, and other surface spectroscopies; selected examples will be reported. Strain rate and preliminary annealing data are presented with a microscopic interpretation.In general, thin metal films are less ductile than their bulk counterparts, grain sizes are much smaller, and they may possess large stresses and unexpected impurities, but have mechanical properties that can be modelled.

Download Full-text

Tensile properties of PolyLactic Acid Composite Foamed via Supercritical Carbon Dioxide

Journal of Physics Conference Series ◽

10.1088/1742-6596/2129/1/012007 ◽

2021 ◽

Vol 2129 (1) ◽

pp. 012007

Author(s):

N M Nordin ◽

H Anuar ◽

F Ali ◽

Y F Buys

Keyword(s):

Thin Films ◽

Carbon Dioxide ◽

Tensile Strength ◽

Supercritical Carbon Dioxide ◽

Essential Oil ◽

Tensile Properties ◽

Polylactic Acid ◽

Treatment Period ◽

Cinnamon Essential Oil ◽

Supercritical Carbon

Abstract Tensile properties of foamed PolyLactic Acid (PLA) composite were studied. In this work, PLA were incorporate with Durian Skin Fibre (DSF) and Cinnamon Essential Oil (CEO) to form PLA bio composite and further treat via supercritical carbon dioxide (SCCO2) to form foamed PLA bio composite. The tensile strength value of foamed PLA bio composite slightly drops from foamed PLA. As for stress strain graph, the percentage of strain for foamed PLA and PLA bio composite did not distinct much. Through SEM, the foamed PLA bio composite showing that it did not fully foamed after treated via SCCO2 which due to treatment period and the thickness of the thin films.

Download Full-text

OS1501 Effect of Thickness on Tensile Properties of Parylene C Thin Films

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2011._os1501-1_ ◽

2011 ◽

Vol 2011 (0) ◽

pp. _OS1501-1_-_OS1501-2_

Author(s):

Qiang Chen ◽

Norio Kawagoishi ◽

Gen Hashiguchi ◽

Takaaki Suzuki ◽

Y-C. Tai

Keyword(s):

Thin Films ◽

Tensile Properties ◽

Parylene C

Download Full-text

An electrical method for the measurement of thermal expansion of thin films

Journal of Physics E Scientific Instruments ◽

10.1088/0022-3735/14/12/007 ◽

1981 ◽

Vol 14 (12) ◽

pp. 1378-1380 ◽

Cited By ~ 8

Author(s):

H V Tiwary ◽

G D Sao

Keyword(s):

Thin Films ◽

Thermal Expansion ◽

Electrical Method

Download Full-text

Phenylethynyl Terminated Arylene Ether Oxadiazole and Triazole Oligomers and Their Cured Polymers

High Performance Polymers ◽

10.1088/0954-0083/13/4/309 ◽

2001 ◽

Vol 13 (4) ◽

pp. 313-322 ◽

Cited By ~ 9

Author(s):

C M Thompson ◽

P M Hergenrother

Keyword(s):

Thin Films ◽

Tensile Properties ◽

High Performance ◽

Mechanical Performance ◽

Tensile Shear ◽

New Materials ◽

High Performance Polymers ◽

Arylene Ether

Several novel phenylethynyl terminated arylene ether oligomers containing oxadiazole and triazole rings were prepared as part of an effort to develop high performance polymers with an attractive combination of properties (e.g. processability and mechanical performance) for future NASA applications. The oligomers displayed low melt viscosities and good solubilities. Thin films cast from solutions of the oligomers and cured for one hour at 350 °Cinairgave good tensile properties. Titanium to titanium (6Al-4V) tensile shear specimens were readily fabricated and provided moderate strengths. The chemistry and properties of these new materials are discussed.

Download Full-text